Hapalopilus tabuliformis Y. C. Dai, Xin Zhang, Ghobad-Nejhad & Yuan Yuan, 2024

Zhang, Xin, Zhou, Hong-Min, Ghobad-Nejhad, Masoomeh, Liu, Hong-Gao, Vlasák, Josef, Dai, Yu-Cheng & Yuan, Yuan, 2024, Molecular and morphological data reveal two new polypores (Polyporales, Basidiomycota) with reddish brown to orange basidiomata from China, MycoKeys 107, pp. 75-94 : 75-94

Hapalopilus tabuliformis Y. C. Dai, Xin Zhang, Ghobad-Nejhad & Yuan Yuan sp. nov.

Figs 4 , 5

Holotype.

China. Inner Mongolia Autonomous Region, Alxa County, Beisi Forest Park , on fallen branch of Pinus tabuliformis , 18 September 2022, Dai 24540 ( BJFC 039782 ).

Etymology.

Tabuliformis (Lat.) : refers to the species growing on Pinus tabuliformis .

Diagnosis.

Hapalopilus tabuliformis is characterized by resupinate to effused-reflexed basidiomata having a pale pink to buff-yellow pileal surface and purple coloration in KOH solution, small pores 3–5 per mm, the absence of cystidioles, long and narrow basidia measuring 18–31 × 3.2–5.8 μm, broadly ellipsoid basidiospores measuring 3.2–4 × 2.6–3.2 μm, and growing on Pinus tabuliformis in western China.

Fruitbody.

Basidiomata annual, resupinate to effused-reflexed, adnate, soft corky and without odor or taste when fresh, becoming brittle to hard corky upon drying. Pilei projecting up to 0.9 cm, 1.2 cm wide and 3 mm thick at base. Pileal surface pale pink to buff-yellow when fresh, becoming honey-yellow when dry. Pore surface light vinaceous gray to grayish violet when fresh, becoming buff to grayish brown when dry; margin cream to pale ochraceous, fimbriate and thinning out when resupinate, up to 1 mm wide; pores angular to irregular, 3–5 per mm; dissepiments thin, entire to lacerate. Context honey and corky when dry, up to 2 mm thick, becoming purple in KOH solution. Tube layer concolorous with pore surface, corky, up to 1 mm deep.

Hyphal structure.

Hyphal system monomitic; generative hyphae bearing clamp connections, richly encrusted with fine yellowish crystals (dissolved in KOH solution), IKI –, CB –; tissue becoming purple in KOH solution.

Context.

Generative hyphae hyaline, slightly thick- to thick-walled, occasionally branched, interwoven, 2–4.3 µm in diam.

Tubes.

Generative hyphae hyaline, thin- to slightly thick-walled, frequently branched, interwoven, flexuous, 3–5.9 µm in diam. Cystidia and cystidioles absent. Basidia clavate to pyriform, bearing four sterigmata and a basal clamp connection, 18–31 × 3.2–5.8 μm; basidioles similar in shape to basidia, but smaller.

Spores.

Basidiospores broadly ellipsoid, hyaline, thin-walled, smooth, usually with a guttule, IKI –, CB –, (3 –) 3.2–4 (– 4.2) × (2.5 –) 2.6–3.2 (– 3.4) μm, L = 3.68 μm, W = 2.76 μm, Q = 1.25 (n = 60 / 2).

Ecology and distribution.

Growing on fallen branches of Pinus tabuliformis . Known from the type location only.

Type of rot.

White rot.

Additional specimen examined.

China. Inner Mongolia Autonomous Region, Alxa County, Beisi Forest Park, on fallen branch of Pinus tabuliformis , 18 September 2022, Dai 24535 ( BJFC 039777).

Figures

Figure 4. Basidiomata of Hapalopilus tabuliformis (Dai 24540).

Figure 5. Microscopic structures of Hapalopilus tabuliformis (Dai 24540, holotype) a basidiospores b basidia c basidioles, d hyphae from context e hyphae from tube trama.